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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37b5ab6dd679e66dc1282d2953be0be8032727ced80773a8572febd87a85771' 
  AND token = 's5rLH3wkuDXHcYGCOj4mbNuouXk/O1MnGfCGV48IOLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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