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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b168e5b51e27ba48f67e0fa8a3616bf34bcfbbf59216f69e0639135fe14341' 
  AND token = '1Xl7xJsgQHOExRuATynwx8SOLF434/dwQm0lpj4UnLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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