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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bc10b509fc7cbcdfb806516e1b8fb08b4fda25aed6132be32ef46d913ab0f9' 
  AND token = '6dxOc94oMO8DT5Yyqpjdo+VgOdE76xQDpxBnILyRU9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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