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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8267108a52178bdf68eea4ef5e4e1d81377e0ddf4e8d7dcaf8eec9b104f731a2' 
  AND token = 'qVvZEvUaiTV1PazmR2SjPfHipwb7HwE7XPhrN/Dv50w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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