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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d2c47ea672f3fdb43cdb4e25652a595e24f181263f3c60bb6540dcb7d8d10b' 
  AND token = 'AkSABUxU06ppeY1MBhukkbvac+IPGogZKotFxrFW+8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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