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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f4d5c5bfedba3d029c745eb7ff7dd283e58486bc0bd0f75e85d307a7ab6e57' 
  AND token = 'ZTnDiRqZnB8wBJkmhqm8xxQYM+PE9ZH4qmHp0qYqD0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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