SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb45965ea857d46c2efdf375b756137a2e282f3fd2dc0265fd8f34158b1bf692' 
  AND token = 'G9XNqw5MQJvMjsjanNX0zCd5xZV52R72HL9XVfh7xWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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