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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ffdbcef90be023e7fedd68560813cead5ccf80a9fe7fa2d029f3ba224bb24e' 
  AND token = '2lifPm0VhFGmatcBO69tMJJvG4nakNZwsm3kHwly/Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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