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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b55b15b5e14cdcb3cb3e619c3c56930577808df864f8941e95f88ef9d70800' 
  AND token = 'kq9Wwzfb2CZpnrcfWvvnFz43M0qCk5/RVGlCzq404bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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