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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8038aae5e39d1327089c50ae129abf25a1020bf070bfdadb57c6d6a14ee7696' 
  AND token = 'AsGLFkwjVKX8FEZ6tPNaCfxAOgBrSDh23lpI8C6MueQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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