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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f4523c9a8af1b1d817408d1d9a4ea5e3c43715ac6b38d9b935e602db27844a' 
  AND token = 'lIe1+8ZVOSiPq3S1QknYi1ypnjBqoKTZroKbWEuskaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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