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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9448b6023df7c6d57cd86fd26ba2868a85c47e50bbdf56ed9e5d8bf930dc8ace' 
  AND token = '3I/Xt+vc/EkThtn+tJogg+v1zFr0LcMozAvhY83xIZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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