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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf53f1ec4c810557a9f3248431ec30e6df7c08f9bebe021aae467ee3dd144ff' 
  AND token = 'dVhd37+D/67mqr8eFa6N3OGPiHviYxIutCgO1ggOG08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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