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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034c22c2d9c530ba2fdf2d05cc4847e8b2f11802ccbcd988e7aa906f69e6391a' 
  AND token = 'BypUC4DfMIBGbHUQFKJdyp9ZweUwmpJhgb5dHQNwa6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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