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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8a848ea606e0fe6e2cf6ae3d7f0ed2b8e79f61f50892fbb25c96d1a58bda09' 
  AND token = 'z+/wy4+QDeSG5rUsSrmSojjhCKnBxKcZT1xn+rxZfjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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