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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f996da3f0b51a68e8e351626bfc5b1b68cbc245a15b1566eedc8dd35a81ce56c' 
  AND token = 'FBwYtMX/tlBzZ4T/tr97+F0nS+50GLK5dgk7BvNrKz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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