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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896073f8a7bd56df99e63128bdf21b97efcbe998a1740ffbd06779d2135bac71' 
  AND token = 'brNrDLP0v+NdMm5V1zk7PDaOCcsBE1NVx2jYRE7pFYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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