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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d02070ff3ed8273fc3fab208e2ee92857b36d67519639f4c41f6e3a8a04a9b6' 
  AND token = 'Ax+FExVoixLStl9ADHmE+9JO5XfSjgLVUbWtNUIH5zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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