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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56ca1960a0952a6b13d5e727dd91418ed44aa42d8bfb06a6cea489011bd9d7c' 
  AND token = 'm+ivBdh2R0I61V62b7Dl6ZPDssTCqGz8Pd3BGOLzgTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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