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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a04d11deca18195107457f6f9bd2f083664dba6c055f5f94e3f9a42de86fe3' 
  AND token = 'dXgvJ6vjmqPHQa0EQlsy9Xn7QLlbge4UghNO6XcaCaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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