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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ca4d6e86aff2779748d0a30fa199e92313697e6843eda0309f940002aa05c1' 
  AND token = '9KiF0/GQ0BjnwQZLakGPxtMOOdSWFaqijycL9j/lkdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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