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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98a9c6ed2f3f4459c359581b8aab474bad4b800dd73290ceca1efeda348f97e' 
  AND token = 'Vbv3RiVdpfS/FjlB/nccvlj/FLMtavpO+k4nQ3w0NCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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