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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713bca31c8974b00034599b4823bcfc06df2f14782ab80d1c096ed883215d657' 
  AND token = 'y2e+zMo0LBiWH0+0LVx8CFg/4Cb2YQNn65PLMFDmlLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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