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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d67cce336a906d8b38b49926f1b66bcc792d5c4f74dd3cd78e958d0f54adf2' 
  AND token = 'k0fOx8NzkdKgLqz4i2Dz6rQgTsyCZXYXqny3gBCldhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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