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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6a7c83f812df173a25c06ab6ebc99555ee9656d81f539518049b595b9df9c7' 
  AND token = '5x0feGPSZd6QEvwjUv/OxH8RsF5Yh8AqHOdxFAhTfcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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