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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cace8add04a22c5d1971ef84c7c0eb5106e923bf384898f228babec219c25daf' 
  AND token = 'EjNoawj4skuUZppaDmK4nW2jsBLo+uRGl6vN/0Ujs7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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