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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a207a4704041ab2614201769271ce32e3279812fa830216c53aa56974309629' 
  AND token = 'WCtLFi6THCfV/Ne/bMou0bZXhkUqwl3jyxa8IDdn8uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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