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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baba8ad89d072e4c27090319e9a45b713b90a6f62caa4d8f368a8b6b1c246b32' 
  AND token = 'uJY1z2fT4dZAaIrXr/1pVLbnFfSj6qWN6m+tWgKahA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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