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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b23f6ec0e2758697848f9715ef331409df1735abae61b089f07b0267e9b5ade' 
  AND token = '6Jfafzm933eLm1IdAmm8IlFHBofzyeuB9YmWCL3jBdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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