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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44fefec1851af894d9207010967ea840e32d58ba7943ba88cf1da4422d5de79' 
  AND token = 'mLWSq8wBOXFkIspZKbUmsDxX68kNwudAwi2qQuBBBo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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