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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c671e83ace3f2bcee7d7e02e59e33e33e3c91a8c8e51f9be145d0816e13ca64e' 
  AND token = '3SiNw34sJ9fvgny7Y2mOoBvr14AKlqvce3+kwmqXCyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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