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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e9575983b0992ad6bc87702ee024ab30e993f31a3fdf85a126852138fa39e2' 
  AND token = 'zfmRDkT019ggMYvXHN6nAXVxgw5M7zutI7oIzeisLlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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