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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a684c52acecd4ef72ef2224b3095032ddd40c4684b96ed183bfe66f4c7b379' 
  AND token = 'S9WhaqrCFEcPcEcoNMwSv+TAHh3LNSdAJcIKr1SdnFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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