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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08b7be83f56d8450a230946bd0ae7b2840e3b56298612de24d1efc08e8f84fe' 
  AND token = '16CbAp2Hue5Sw5nEpdZfcln3Sq7bI3R2gQ57JWjxV6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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