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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711076ae695d9f933e54754bd7b897ddaffc83705818d36ffbbd7db5b6600f86' 
  AND token = 'B2qcsaX42T30use395BRZUSkAkk0DddrwOhHC0p8zqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}