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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f7d07f22ebe3f6cb2491cab8a44c1d2de61d84d656652e5b2a3a0f845121ee' 
  AND token = 'yLSzG3VVohRlFb5bQWe8+CUhYy6IGu1MiFdxBYSjIo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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