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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94202238a781b76d451271aa70ac5faad668d8750c9083f74d402280b27b6428' 
  AND token = 'j0gYfub7NXZ9pejke5ED29+enYkyJYRemoUjuPqhVt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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