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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf63867922c2d849fa2312086278edefa7cbaa22ae20fae461ee87c5da62eaa1' 
  AND token = 'l0OkFfgKW/C9tdItTItSlJFYWh8SMZubra6BjfUqUIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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