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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ad782155def53b88b0136ab7ec5aabe9d3b22d820f467de183e54e4d76ecdd' 
  AND token = '8RG7DF0hEEzaCQBH7/sbx9r9oa1Z8g2t6LL2+b9K2T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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