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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c48a272fff83869818e8cf64f1932e4c2af8818342fc8d9ac851684ab94c23' 
  AND token = '2TqWmBp/YrcIVCQFnB6+q46iPcs+854/0XaurKsz84k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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