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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b61d9c69280de114dde09ca1dd3e6d45fcd1d4140b60bc4da873d898943d9f' 
  AND token = 'SG0p3hI8ZSY+k2N4w28ChQyMai5i2FZ5xwenJ5iuLuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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