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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955dc52a0a9acd47e4d0d23b91ad823b15565ec6328146e297a11b310c0190db' 
  AND token = 'bwyshDcXY0+4iqqqI4/PV6Bae7rwN+aj9EBuBe9/Sbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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