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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004c315639b5f29289232919aa8030d32a07293487012105d252db6da34d7d84' 
  AND token = 'LNd2W+CyVmMrQg+VjWdftoUy0xZUkXuNwC6jgx4oCac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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