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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5681aca3296b70c88da65550b93d61fd8f7efbcb79746a575d5b4ae17a1fd1' 
  AND token = '2cIVaptLx4eaK0v2dDt2um8s0eEZmqYw706cdgh9KsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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