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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ba81608a9e1af532599994ed1cce94f6931ae10116ba019ff4f3a6ef074caa' 
  AND token = 'hLKzP0DiVy7YS6ii+EeEwctUfZG+VoIRC9DWHAc5S/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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