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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e31b464370b3cf65a342d5d1b26ef852412b7129164239b424f0d1182204dc' 
  AND token = 'D+qcBYHUq9vnheVaR2TkLAux07A1U00NgdM9zW32730=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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