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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31aebdb58e35403fd29c397efd64bfad6fa91f4a2cd01c248c6d3c166da5fe5' 
  AND token = 'IoHxEWWYFUCMNwOUZDvWF9/d8218iA/LAKtM5r5e2Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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