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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026e06a9ac014d7bb9cafe394ef13309f3075d85f8d7d74ac79441b063ee5c6e' 
  AND token = '00xh04g6kjMHDwiJev+YhtcVB54dBhvzBRYg9Ze9xZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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