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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09de69504a5a398b7ccdd2d2ff6dd723af52778bcb84bf9b0c487d88e7c9b961' 
  AND token = 'C1yabmy+1GGzxGu7G/SdsDVsPMaNMxRu5DRM4fiZpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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