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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462620060ac83e4cb3e689d988c823ff6029f9d9d4a83ea86475fe5801a7b1cc' 
  AND token = 'w1TPsS2tEza7mQ40Tyeqgos9O0OJkFU4FcwxEHkhSVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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