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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8828c3eeaef42ccb43d816368c683435c02ad3a563730fe539a5749e91617ff' 
  AND token = '4FuSN88IbqDMeZVGJLnuYxPn77c3Fm6Yt1sYmx3Fevw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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