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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd62dfaecf397c56f1e78334f94d608b4844233ff7b59ee2ae13366b3faa282b' 
  AND token = '1NgwR3alTtyMB0ekZv4VEqdY7HQUeJWviRMR6O1wAJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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