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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28da034c094348e33a0578e0d58e43532c4b31dc4787b4426678e07a8cc27864' 
  AND token = 'qftwYUl/CAxfcav2CSIS/VKvdWKejO8fOxXDuhM4vTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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