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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985c01df7243e07160d15ad33acdfba60d2cab8111b8503ea09eadfebddee0b9' 
  AND token = 'Ozpze2r4Xp7YEKLrdSsfyAmo0HmfIhBQ6e4fUNn1chs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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