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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b93b6b5baa7eaf6d894699ee88790e7c4a24b41ce3e9061ce322ccc140d5948' 
  AND token = 'VECxew97qqCpyP097noFdkAby1W/4nddVzGyzlaS2ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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