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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1850b28af48999962ce58a6599560aed14463b186cd0e367cd5cb9a5683ee4' 
  AND token = '070JChfvJ8DHQ+uGB5kHYXU4H0KyAaaLrZ3YFPfbaAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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