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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df8b051bf4d36056c76cb3a7061515f8a709311be1e1ca6204784145c671b26' 
  AND token = 'CKJGOxqw66ck8acN0n2mWqGC86WsGMz/7WV4ocUXVWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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