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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a532fb87047aa9cfc796668d119029e1339d53a5fe7f3a28f89c6193b9a3354e' 
  AND token = 'pA7j++BhLI0dSKZ0adWjsq03foelEs1TdoayYMGVFIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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