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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0a15e8773eb53e104d46e5025ad210064f0b73cebbf076b37d214a5d5a5383' 
  AND token = '6dSgb6/fxYBEbJDawTx7vJMDAgaCTX817hzv65DW8Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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