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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcc3abc07a3aae97311feaa7bd9da7095beecd95470b4e467579137f2d51bf9' 
  AND token = 'yE4v1duDp7C7mKErHNMtHfCFfVLnLiKM7HCI47VisTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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