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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97700d56df7a4f534f05d113bf108c4eddc13f6bed95f88fe42fb9d475935731' 
  AND token = '/bTGcYLqVWeT6xEr0RezLMcntA0smhPYva40hI9HBL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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